Crc-128 bits source code in c++

dpcfire asked:

Hi everybody. I have been looking for some c++ source code or example for a CRC 128 bits, I already have de polinomial: x128 + x127 + x65 + x64 + x + 1
I have found many examples for crc until crc-32 but I have no idea about how to transform these examples into a crc-128... Could anybody help me in any way? thanks in advance